The green light is the
most lonely of the
three traffic lights. Compared to the
yellow and the
red light, they have little
experience with other
illumination than from their equal (not
counting the lights facing other
directions in the
intersection.)
Red and yellow lights are often seen simultaneously on top of the same traffic pole. And rumors say they enjoy eachothers company.
The lonely green lights, on the other hand, are blessed with the gift to see one or two drivers smile when vehicles drive by.